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color: Landrarity: Rarecard type:artist(s):card text: As Cavern of Souls enters the battlefield, choose a creature type. {T}: Add {1} to your mana pool. {T}: Add one mana of any color to your mana pool. Spend this mana only to cast creature spells of the chosen creature type. If this mana is spent on a spell, that spell can't be countered.